One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(7,8)(9,10)(11,13)(12,15)(14,16)(18,24)(19,20)(26,32)(27,28) involution — undirected(1,2,5,6)(3,7,4,8)(10,11)(14,15)(17,18)(19,21)(20,25)(22,26)(23,24)(27,29)(28,30)(31,32)(1,3,5,4)(2,7,6,8)(9,11,13,10)(12,15,16,14)(17,19,23,20)(18,21,24,25)(22,27,31,28)(26,29,32,30)(1,3,5,4)(2,7,6,8)(9,12,13,16)(10,14,11,15)(17,20,23,19)(18,25,24,21)(22,28,31,27)(26,30,32,29)(1,3,5,4)(2,7,6,8)(17,21,23,25)(18,19,24,20)(22,30,31,29)(26,28,32,27)(1,4,5,3)(2,8,6,7)(17,22,23,31)(18,26,24,32)(19,27,20,28)(21,29,25,30)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.